[mmd96]

Hi, I want to get ''xpos'' variable in my UDF code (which has been attached) as an output parameter for plot xpos vs time in cfdpost.
Thanks.

#include "udf.h"

DEFINE_SDOF_PROPERTIES(sphere, prop, dt, time, dtime)
{
real xpos;

prop[SDOF_MASS] = 0.786;
prop[SDOF_IXX] = 0.00000786;
prop[SDOF_IYY] = 0.00000786;
prop[SDOF_IZZ] = 0.00000786;
                   
xpos = DT_CG(dt) [0];  

}

[lbj007]

try to use UDM to store the variable

[mmd96]

Thanks for your reply. I will be grateful if tell me which macro should I use.

[AlexanderZ]

better to write to file, as xpos is same for the whole domain at specified time moment
compile code:

#include "udf.h"

DEFINE_SDOF_PROPERTIES(sphere, prop, dt, time, dtime)
{
real xpos;

prop[SDOF_MASS] = 0.786;
prop[SDOF_IXX] = 0.00000786;
prop[SDOF_IYY] = 0.00000786;
prop[SDOF_IZZ] = 0.00000786;
                   
xpos = DT_CG(dt) [0];
  
host_to_node_real_1(xpos);

#if !RP_NODE
	if ((fp = fopen(out_xpos, "w"))==NULL)
		{
			Message("\n Warning: Unable to open %s for writing\n",out_xpos);
			exit(0);
		}
	else
		{
			fprintf(fp, "%f	%f\n",time, xpos);
			Message("\nWriting data to %s...",out_xpos);			
		}
#endif	
}